| 摘要 |
<P>PROBLEM TO BE SOLVED: To absorb and remove vibration from an external mechanism by contraction operation of a cab lifting hydraulic cylinder to prevent impulsive vibration from propagating to a cab. <P>SOLUTION: A cab lifting device 11 of a construction machine includes: position detection means 37 for detecting that a cab lifting hydraulic cylinder 22 reaches a position in front of a stroke end; an electromagnetic control valve 38 for controlling telescopic motion of the cab lifting hydraulic cylinder 22; and a relay 54 provided on operation signal lines 40, 41 of the electromagnetic control valve 38 and operated by a detection signal of the position detection means 37. When the relay 54 is operated by the detection signal of the position detection means 37, the electromagnetic control valve 38 is switched to a neutral position and thereby the cab lifting hydraulic cylinder 22 stops immediately at the position in front of the stroke end. <P>COPYRIGHT: (C)2013,JPO&INPIT |
